01 -
Preheat the oven to 150°C. Evenly spread flour on a baking tray and bake for 8 minutes. Allow to cool completely. Combine with salt.
02 -
In a mixing bowl, beat butter and sugar at high speed for 2 minutes until pale and fluffy. Scrape down the bowl, add vanilla and milk, and mix on medium until smooth.
03 -
Add baked flour-salt mixture and sprinkles to the wet ingredients. Mix on low just until combined.
04 -
Line a baking tray with parchment paper. Using a small scoop, portion dough, flatten into discs, and arrange 15 discs on the tray. Freeze while preparing cake batter.
05 -
Reserve two 120 g portions of dough for cake filling. Roll leftover dough into small balls for decoration, place on a lined plate, and freeze until use.
06 -
Preheat oven to 175°C. Grease three 20 cm cake pans with nonstick spray, line with parchment circles, and grease again.
07 -
Sift flour, baking powder, baking soda, and salt into a medium bowl. Set aside.
08 -
In a large mixing bowl, beat butter, oil, and sugar at high speed for 2 minutes until pale and fluffy. Scrape bowl, add vanilla, eggs, and sour cream, mixing on medium until well combined.
09 -
Gently mix sifted dry ingredients and buttermilk into wet ingredients on low speed until just blended. Finish folding with a rubber spatula.
10 -
Divide batter evenly among prepared pans. Press 5 frozen cookie dough discs into each layer.
11 -
Bake at 175°C for 26–32 minutes, or until a toothpick inserted in the center comes out clean. Cool in pans for 10 minutes, then remove to a rack to cool completely.
12 -
Sift powdered sugar into a bowl. In another bowl, beat butter at high speed for 2 minutes. Add cream cheese and mix for 1 minute, scraping the bowl. Gradually add powdered sugar on low. Finish with vanilla and salt. Beat at high speed until creamy.
13 -
Trim domes from cooled cake layers. Place first layer on serving board. Spread 180 ml frosting and pipe a border around edge. Distribute a reserved portion of cookie dough within border.
14 -
Add second cake layer and repeat frosting and cookie dough filling. Place final layer with base side up.
15 -
Apply a thin layer of frosting around cake as a crumb coat. Freeze for 15 minutes.
16 -
Frost the entire cake with remaining frosting. Top with chilled cookie dough balls and additional sprinkles.